19-3461; Rev 0; 11/04 ILABLE N KIT AVA IO T A U L A EV 1.2A White LED Regulating Charge Pump for Camera Flashes and Movie Lights The MAX1577Y/MAX1577Z charge pumps drive white LEDs, including camera strobes, with regulated current up to 1.2A (guaranteed to 800mA). The very low openloop output resistance allows high flash brightness, even from a low battery input voltage. The adaptive 1x/2x regulating charge-pump operation provides high efficiency (up to 92%) while in movie mode or backlighting. Fast (1MHz) switching allows the use of tiny external components. The MAX1577Y/MAX1577Z use an external resistor to set the full-scale LED current. Two enable inputs (EN1 and EN2) provide simple on/off control and LED current of 20%, 33%, or 100% full scale. If there is less than 24mV across the external resistor, the output voltage is regulated. The MAX1577Z has fixed 5.1V output-voltage regulation, while the MAX1577Y has logic-controlled output voltage of 3.4V, 4.6V, or 5.1V for backlighting, keyboard, and RGB applications. The MAX1577Y/MAX1577Z are available in an 8-pin, 3mm x 3mm TDFN package (0.8mm max height). Applications Features ♦ Up to 1.2A Output Drive Capability (800mA Guaranteed) ♦ Up to 92% PLED / PBATT Efficiency for Movie Mode ♦ Flexible Brightness Control Two-Bit Logic for 100%, 33%, 20%, and Off PWM for 20% to 100% ♦ 3% Current Regulation Over Line and Temperature ♦ Current or Voltage Regulation for Flash and Backlighting (MAX1577Y) ♦ Current Regulation for Flash (MAX1577Z) ♦ Low Ripple and EMI ♦ 2.7V to 5.5V Supply Voltage Range ♦ Soft-Start Limits Inrush Current ♦ Output-Voltage Regulation Mode ♦ Thermal-Shutdown Protection ♦ 8-Pin 3mm x 3mm TDFN Package White LED Flashes, Strobes, and Movie Lights Ordering Information LCD Backlighting Camera Phones, Cell Phones, and Smart Phones PART TEMP RANGE PINPACKAGE MAX1577YETA -40°C to +85°C 8 TDFN (T833-2) AMG MAX1577ZETA -40°C to +85°C 8 TDFN (T833-2) AMQ PDAs, Digital Cameras, and Camcorders Pin Configuration IN UP TO 1.2A GND 5.3V OVP IN CN 2.7V TO 5.5V CS CP TOP VIEW OUT Typical Operating Circuit 1µF OR 2.2µF TOP MARK 8 7 6 5 OUT 4.7µF 10µF GND MAX1577Y MAX1577Z MAX1577Z 1 2 3 4 CN EN2 EN2 CS CP EN1 VOUT - (300mV OR 100mV OR 60mV) EN1 100%, 33%, 20%, AND SHUTDOWN TDFN ________________________________________________________________ Maxim Integrated Products For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com. 1 MAX1577Y/MAX1577Z General Description MAX1577Y/MAX1577Z 1.2A White LED Regulating Charge Pump for Camera Flashes and Movie Lights ABSOLUTE MAXIMUM RATINGS IN, OUT, EN1, EN2 to GND ...................................-0.3V to +6.0V OUT to GND During Shutdown....................-0.3V to (VIN + 0.3V) OUT to CS .............................................................-0.6V to +0.6V CS to GND................................................-0.3V to (VOUT + 0.3V) CN to GND...................................................-0.3V to (VIN + 0.3V) CP to GND .....-0.3V to the Greater of (VOUT + 1V) or (VIN + 1V) OUT Short Circuit to GND ..........................................Continuous Continuous Power Dissipation (TA = +70°C) 8-Pin TDFN (derate 18.2mW/°C above +70°C) ..........1455mW Operating Temperature Range ...........................-40°C to +85°C Junction Temperature ......................................................+150°C Storage Temperature Range .............................-65°C to +150°C Lead Temperature (soldering, 10s) .................................+300°C Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. ELECTRICAL CHARACTERISTICS (VIN = 3.6V, circuit of Figure 2, EN1 = EN2 = IN, RCS = 60Ω, CIN = 4.7µF, C1 = 2.2µF, COUT = 10µF, TA = -40°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1) PARAMETER CONDITIONS IN Operating Voltage Undervoltage-Lockout Threshold MIN VIN rising 2.3 Undervoltage-Lockout Hysteresis Supply Current Shutdown Supply Current TYP 2.7 2.45 MAX UNITS 5.5 V 2.6 35 1MHz switching, no load 5 0.225 0.3 TA = +25°C 0.01 1 TA = +85°C 0.2 1x LDO mode, no switching EN1 = EN2 = GND V mV mA µA Soft-Start Time 0.5 ms OUT Overvoltage Protection 5.3 V MAX1577Z, TA = +25°C, IOUT = 100mA OUT Voltage Regulation Mode MAX1577Y, TA = +25°C, IOUT = 100mA EN1 or EN2 = IN 4.95 5.10 5.25 EN1 = GND, EN2 = IN 3.17 3.40 3.60 EN1 = IN, EN2 = GND 4.40 4.60 4.80 EN1 = EN2 = IN 4.95 5.10 5.25 CS Voltage-Mode Threshold (VOUT - VCS) CS Regulation Voltage (VOUT - VCS) CS Threshold Accuracy Maximum OUT Current Open-Loop OUT Resistance OUT Internal Pulldown in Shutdown Switching Frequency 2 24 EN1 = GND, EN2 = IN 60 EN1 = IN, EN2 = GND 100 EN1 = EN2 = IN 300 TA = +25°C -2 VIN = 2.7V to 5.5V, TA = -40°C to +85°C -3 VLED = 4.1V, EN1 = EN2 = IN ±0.5 600 900 VIN = 3.4V 800 1200 1x LDO mode mV mV +2 +3 VIN = 3.1V 2 EN1 = EN2 = GND 5 0.80 1.0 _______________________________________________________________________________________ % mA 0.6 2x mode, VIN = 3.4V V 3 Ω kΩ 1.25 MHz 1.2A White LED Regulating Charge Pump for Camera Flashes and Movie Lights (VIN = 3.6V, circuit of Figure 2, EN1 = EN2 = IN, RCS = 60Ω, CIN = 4.7µF, C1 = 2.2µF, COUT = 10µF, TA = -40°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1) PARAMETER CONDITIONS EN_ Logic-High Voltage EN_ Logic-Low Voltage MIN VIN = 4.2V to 5.5V 1.6 VIN = 2.7V to 4.2V 1.4 TYP MAX V VIN = 2.7V to 5.5V Logic Input Current VEN_ = 0V or 5.5V Thermal-Shutdown Threshold TJ rising UNITS 0.4 TA = +25°C 0.02 TA = +85°C 0.02 V 1 µA +160 °C 20 °C Thermal-Shutdown Hysteresis Note 1: Limits are 100% production tested at TA = +25°C. Limits over the operating temperature range are guaranteed by design. Typical Operating Characteristics (VIN = 3.6V, circuit of Figure 2, RCS = 0.27Ω, Luxeon LXCL-PWF1 LED, TA = +25°C, unless otherwise noted.) EFFICIENCY vs. SUPPLY VOLTAGE EFFICIENCY (%) 370mA AT 3.33VF 400 70 60 50 40 30 220mA AT 3.15VF 370mA AT 3.33VF 1100mA AT 3.78VF 20 200 3.9 4.3 4.7 5.1 5.5 0 2.7 3.1 SUPPLY VOLTAGE (V) LED CURRENT vs. SUPPLY VOLTAGE 700 4.7 5.1 5.5 770mA AT 3.66VF 500 250mA AT 3.21VF 300 200 80 70 60 50 40 250mA AT 3.21VF 150mA AT 3.06VF RCS = 0.39Ω 2.7 3.1 3.5 3.9 4.3 4.7 SUPPLY VOLTAGE (V) 5.1 4.3 4.7 5.1 5.5 1800 RCS = 0.39Ω 1600 1400 1200 770mA AT 3.66VF 1000 250mA AT 3.21VF 800 600 150mA AT 3.06VF 200 RCS = 0.39Ω 0 5.5 3.9 400 10 150mA AT 3.06VF 3.5 BATTERY CURRENT vs. SUPPLY VOLTAGE 20 0 3.1 SUPPLY VOLTAGE (V) 770mA AT 3.66VF 90 30 100 2.7 EFFICIENCY vs. SUPPLY VOLTAGE EFFICIENCY (%) LED CURRENT (mA) 4.3 100 MAX1577 toc04 800 400 3.9 SUPPLY VOLTAGE (V) 900 600 3.5 BATTERY CURRENT (mA) 3.5 220mA AT 3.15VF 500 0 3.1 370mA AT 3.33VF 1000 10 220mA AT 3.15VF 0 2.7 1100mA AT 3.78VF 1500 MAX1577 toc06 RCS = 0.27Ω 2000 MAX1577 toc05 LED CURRENT (mA) 600 RCS = 0.27Ω BATTERY CURRENT (mA) 80 1100mA AT 3.78VF 800 RCS = 0.27Ω 90 2500 MAX1577 toc02 MAX1577 toc01 1000 BATTERY CURRENT vs. SUPPLY VOLTAGE 100 MAX1577 toc03 LED CURRENT vs. SUPPLY VOLTAGE 1200 2.7 3.1 3.5 3.9 4.3 4.7 SUPPLY VOLTAGE (V) 5.1 5.5 0 2.7 3.1 3.5 3.9 4.3 4.7 5.1 5.5 SUPPLY VOLTAGE (V) _______________________________________________________________________________________ 3 MAX1577Y/MAX1577Z ELECTRICAL CHARACTERISTICS (continued) Typical Operating Characteristics (continued) (VIN = 3.6V, circuit of Figure 2, RCS = 0.27Ω, Luxeon LXCL-PWF1 LED, TA = +25°C, unless otherwise noted.) LED CURRENT vs. TEMPERATURE MAX1577 toc09 MAX1577 toc08 1.2 MAX1577 toc07 220 1.0 EN1 AND EN2 HIGH LED CURRENT (A) LED CURRENT (mA) TYPICAL OPERATING WAVEFORMS IN 1x MODE LED CURRENT vs. RCS 225 215 210 RCS = 0.27Ω EN1 LOW EN2 HIGH VIN 50mV/div (AC-COUPLED) VOUT 50mV/div (AC-COUPLED) VCS 50mV/div (AC-COUPLED) 0.8 0.6 EN1 HIGH, EN2 LOW 0.4 EN1 LOW, EN2 HIGH 205 0.2 200 0 -40 -15 10 35 85 60 0.2 0.4 0.6 TEMPERATURE (°C) 1.0 0.8 400ns/div RCS (Ω) TYPICAL OPERATING WAVEFORMS IN 2x MODE STARTUP AND SHUTDOWN RESPONSE MAX1577 toc10 MAX1577 toc11 VIN 50mV/div (AC-COUPLED) VEN1, VEN2 2V/div VOUT 50mV/div (AC-COUPLED) VLED 2V/div 0V 50mV/div (AC-COUPLED) VCS ILED 500mA/div 0mA 400ns/div 400µs/div EFFICIENCY vs. SUPPLY VOLTAGE WITH PWM DIMMING LED CURRENT vs. PWM DUTY CYCLE MAX1577 toc14 MAX1577 toc13 1000 DIMMING RESPONSE 80 MAX1577 toc12 1200 70 25% 2V/div VEN1 60 800 EFFICIENCY (%) LED CURRENT (mA) MAX1577Y/MAX1577Z 1.2A White LED Regulating Charge Pump for Camera Flashes and Movie Lights 600 400 50 2V/div VLED 40 50% 30 0V 75% 20 RCS = 0.27Ω EN1 PWM EN2 HIGH 200 ILED 500mA/div 0 0 0 20 40 60 DUTY CYCLE (%) 4 RCS = 0.27Ω EN1 PWM EN2 HIGH 10 80 100 0mA 2.7 3.1 3.5 3.9 4.3 4.7 5.1 5.5 100µs/div SUPPLY VOLTAGE (V) _______________________________________________________________________________________ 1.2A White LED Regulating Charge Pump for Camera Flashes and Movie Lights PIN NAME 1 EN1 Control Logic Input (see Table 1) FUNCTION 2 CP Transfer Capacitor Positive Connection. Connect a 1µF capacitor (or 2.2µF for IOUT > 600mA) from CP to CN. 3 CN Transfer Capacitor Negative Connection. Connect a 1µF capacitor (or 2.2µF for IOUT > 600mA) from CP to CN. 4 EN2 Control Logic Input (see Table 1) 5 GND Ground 6 IN Input Supply Voltage. Connect IN to a battery or supply voltage from 2.7V to 5.5V. Connect a 4.7µF ceramic capacitor from IN to GND. 7 CS Current-Sense Input. Connect a current-sense resistor from OUT to CS to set the output current. Connect the anodes of the LEDs to CS and the cathodes to GND. 8 OUT — EP Output. Connect a 10µF ceramic capacitor from OUT to GND. In shutdown, OUT is pulled to GND with an internal 5kΩ resistor. Exposed Pad. Connect the exposed pad to GND directly under the IC. Table 1. Enable, Dimming, Voltage Mode, and Overvoltage Protection VOLTAGE MODE OVP EN1 EN2 DIMMING LEVEL CS THRESHOLD (VOUT - VCS) MAX1577Z MAX1577Y MAX1577Z 0 0 Shutdown — — — — — 0 1 20% Current 60mV 5.10V 3.40V 5.30V 5.15V 1 0 33% Current 100mV 5.10V 4.60V 5.30V 5.17V 1 1 100% Current 300mV 5.10V 5.10V 5.30V 5.30V MAX1577Y Note: A “0” indicates EN_ is logic low or connected to GND. A “1” indicates EN_ is logic high or connected to IN. _______________________________________________________________________________________ 5 MAX1577Y/MAX1577Z Pin Description MAX1577Y/MAX1577Z 1.2A White LED Regulating Charge Pump for Camera Flashes and Movie Lights C1 1µF* CP 2.7V TO 5.5V IN CN OUT LDO/CHARGE PUMP CIN 4.7µF COUT 10µF GND ERROR AMP CSVMODE VOUT - VCS EN1 EN2 CONTROL MAX1577Y ONLY RCS IMODE/ VMODE MUX 1.25V MAX1577Y MAX1577Z CS 24mV *2.2µF FOR MORE THAN 600mA OUTPUT. Figure 1. Functional Diagram 6 _______________________________________________________________________________________ D1 1.2A White LED Regulating Charge Pump for Camera Flashes and Movie Lights MAX1577Y/MAX1577Z C1 2.2µF* CP CN RCS 5.3V OVP 2.7V TO 5.5V IN CIN 4.7µF OUT OR COUT 10µF GND UP TO 1.2A MAX1577Z EN1 100%, 33%, 20%, AND SHUTDOWN VOUT - (300mV OR 100mV OR 60mV) CS EN2 *1µF FOR LESS THAN 600mA OUTPUT. Figure 2. Current Regulation with the MAX1577Z C1 1µF CP 2.7V TO 5.5V CIN 4.7µF CN 5.1V, 4.6V, OR 3.4V IN OUT COUT 10µF GND MAX1577Y 5.1V, 4.6V, 3.4V AND SHUTDOWN EN1 CS EN2 Figure 3. Voltage Regulation with the MAX1577Y _______________________________________________________________________________________ 7 MAX1577Y/MAX1577Z 1.2A White LED Regulating Charge Pump for Camera Flashes and Movie Lights C1 2.2µF* CP 2.7V TO 5.5V CIN 4.7µF CN 5.3V OVP UP TO 1.2A IN 5.1V, 4.6V, OR 3.4V OUT CIN 10µF GND RCS MAX1577Y 5.1V OR 100% CURRENT, 4.6V OR 33% CURRENT, 3.4V OR 20% CURRENT, AND SHUTDOWN EN1 CS VOUT - (300 OR 100 OR 60mV) MAIN DISPLAY BACKLIGHT EN2 SUBDISPLAY BACKLIGHT RGB DRIVER ASIC CAMERA-FLASH MOVIE LIGHT *1µF FOR LESS THAN 600mA OUTPUT. Figure 4. Flash and Backlighting with the MAX1577Y Detailed Description 1x LDO to 2x Mode Switchover When V IN is greater than V OUT , the MAX1577Y/ MAX1577Z are in 1x LDO mode and regulate the current through R CS . As V IN decreases and the LDO approaches dropout, the 2x charge pump starts boosting the output to maintain the regulation current. When VIN rises enough above VOUT to maintain LDO regulation, the charge pump stops and the MAX1577Y/MAX1577Z switch back to the more efficient 1x LDO mode. Soft-Start The MAX1577Y/MAX1577Z include soft-start circuitry to limit inrush current at turn-on. When starting up with an output voltage that is not near the input voltage, the output capacitor is charged directly from the input with a ramped current source (with no charge-pump action) until the output voltage approaches the input voltage. If current-mode or voltage-mode regulation is met, soft- 8 start is terminated and normal operation begins in 1x mode. Otherwise, after 500µs, the 2x charge-pump softstart operates until the voltage across the sense resistor reaches the current regulation threshold, the output voltage is in regulation, or 500µs has elapsed, whichever occurs first. If the output is shorted to ground, soft-start is repeated until the output exceeds 2.3V. Dimming and Shutdown The MAX1577Y/MAX1577Z use two inputs (EN1 and EN2) to select between three brightness levels and lowpower shutdown mode (see Table 1). By regulating the voltage across the current-sense resistor (VOUT - VCS) to one of three levels, the MAX1577Y/MAX1577Z control the output current, thus providing the three-level dimming. In shutdown mode, the IC is turned off, reducing the supply current to 0.01µA (typ). When the MAX1577Y/MAX1577Z are shut down, C1 is discharged and the output is pulled to GND through an internal 5kΩ resistor. _______________________________________________________________________________________ 1.2A White LED Regulating Charge Pump for Camera Flashes and Movie Lights Output-Voltage Regulation Mode When the voltage across the sense resistor (VOUT VCS) is less than 24mV, the MAX1577Y/MAX1577Z regulate the output voltage. For applications requiring a fixed output voltage instead of current regulation, simply connect CS directly to OUT as shown in Figure 3. The MAX1577Z regulates to a fixed 5.1V. The adjustable regulation voltage (3.4V, 4.6V, or 5.1V) of the MAX1577Y depends on the state of the EN_ inputs (see Table 1). Thermal Protection Thermal protection prevents damage to the IC during overload conditions. When the die temperature exceeds +160°C, the MAX1577Y/MAX1577Z turn off until the die cools by 20°C. Once the die has cooled, the MAX1577Y/MAX1577Z turn on and initiate soft-start. During a continuous overload, this produces a pulsed output. Continous operation at high-output-current settings may induce thermal protection. Capacitor Selection Ceramic capacitors are recommended due to their low equivalent series resistance (ESR), small size, and low cost. Select capacitors that maintain their capacitance over temperature and DC bias. Typically X5R, X7R, or better ceramic capacitors perform well. A 4.7µF input capacitor and 10µF output capacitor are recommended for most applications. Larger values can be used to reduce ripple. For the transfer capacitor (C1), a 1µF capacitor is suitable for output currents up to 600mA. For output currents between 600mA and 1200mA, use a 2.2µF capacitor. Input Ripple In 1x LDO mode there is no charge-pump switching, and thus very little input ripple. The input ripple in 2x charge-pump mode depends on the input source impedance. Typical waveforms showing the ripple in 1x and 2x mode are in the Typical Operating Characteristics. In sensitive applications, increase the input capacitance to reduce input ripple. Applications Information Setting the Output Current For applications requiring a regulated output current, see the circuit of Figure 2. The output regulation current is set by RCS as follows: RCS = (VOUT - VCS) / IOUT where IOUT is the output current (up to 1200mA) and (VOUT - VCS) is the current-sense threshold (see Table 1). For camera-flash applications with a short pulse duration, a 0.25W resistor is recommended. Setting the Output Voltage To regulate the output voltage instead of the current, connect CS directly to the output as shown in Figure 3. In this configuration the MAX1577Z regulates the output to 5.1V. The output voltage of the MAX1577Y is set to 5.1V, 4.6V, or 3.4V using the EN1 and EN2 inputs as shown in Table 1. Driving Camera Strobe/Flash In applications that do not require dimming, such as a camera strobe/flash, connect EN1 and EN2 together and drive as a single on/off control input. Pulse this input high to generate a strobe output. PWM Dimming To vary the brightness from 20% to 100% using pulsewidth modulation (PWM), hold EN2 high and apply the PWM signal (up to 5kHz) to EN1. Holding EN2 high keeps the part enabled and prevents repeated softstarts. The duty cycle of the PWM signal applied to EN1 controls the brightness, where 0% duty cycle corresponds to 20% brightness and 100% duty cycle corresponds to 100% brightness. A PWM signal with a logic-high voltage between 1.6V and 5.5V can be safely used regardless of the input voltage. The voltage of the PWM signal does not affect the brightness level. For highest movie-mode efficiency, it is best to choose R CS so 0% PWM duty cycle provides the desired movie-mode current. Then, the flash current level is adjusted by the PWM duty cycle. When the moviemode current is more than 33% of the flash current, it is more efficient to apply the PWM dimming signal to EN2 while holding EN1 high. Ballast Resistors for Multiple LEDs When using multiple parallel LEDs, add a ballast resistor in series with each LED to help balance the current between the LEDs. When using current regulation _______________________________________________________________________________________ 9 MAX1577Y/MAX1577Z Overvoltage Protection Output overvoltage protection (OVP) protects the IC and other components in case the output is open circuit. The MAX1577Z always limits the output voltage to 5.3V. With the MAX1577Y, the output OVP voltage varies slightly depending on the state of the EN_ inputs (see Table 1). MAX1577Y/MAX1577Z 1.2A White LED Regulating Charge Pump for Camera Flashes and Movie Lights (Figure 2), the ballast resistors must be small enough to prevent triggering the overvoltage protection: RBALLAST < (5.1V - VF) / ILED Note that VF varies as a function of ILED. Typically, LED manufacturers provide a plot of forward voltage (VF) vs. forward current (ILED) in the LED data sheet. where ILED is the current through each LED and VF is the forward voltage of the LED at ILED. Within this limit, larger values of RBALLAST improve LED-to-LED matching but also increase the input voltage where the 2x charge pump makes the transition to the more efficient 1x LDO mode. When using voltage regulation (Figure 3), select the ballast resistors based on the full brightness setting as follows: The MAX1577Y/MAX1577Z are high-frequency switched-capacitor regulators. For best circuit performance, use a solid ground plane and place CIN, COUT, and C1 as close to the IC as possible. Connect the exposed pad to GND directly under the IC and allow sufficient copper area for cooling. Refer to the MAX1577Z evaluation kit for an example PC board layout. With EN1 high and EN2 high: RBALLAST = (5.1V - VF) / ILED TRANSISTOR COUNT: 2482 PROCESS: BiCMOS PC Board Layout and Routing Chip Information The LED current at the dimmed settings are calculated as follows: with EN1 high and EN2 low: ILED = (4.6V - VF) / RBALLAST with EN1 low and EN2 high: ILED = (3.4V - VF) / RBALLAST 10 ______________________________________________________________________________________ 1.2A White LED Regulating Charge Pump for Camera Flashes and Movie Lights 6, 8, &10L, DFN THIN.EPS D N PIN 1 INDEX AREA E E2 DETAIL A CL CL L A L e e PACKAGE OUTLINE, 6, 8, 10 & 14L, TDFN, EXPOSED PAD, 3x3x0.80 mm 21-0137 NUMBER OF LEADS SHOWN ARE FOR REFERENCE ONLY F 1 2 COMMON DIMENSIONS SYMBOL A MIN. 0.70 0.80 D 2.90 3.10 2.90 3.10 0.00 0.05 E A1 L k MAX. 0.40 0.20 0.25 MIN. A2 0.20 REF. PACKAGE VARIATIONS PKG. CODE N D2 E2 e JEDEC SPEC b T633-1 6 1.50±0.10 2.30±0.10 0.95 BSC MO229 / WEEA 0.40±0.05 1.90 REF T833-1 8 1.50±0.10 2.30±0.10 0.65 BSC MO229 / WEEC 0.30±0.05 1.95 REF T1033-1 10 1.50±0.10 2.30±0.10 0.50 BSC MO229 / WEED-3 0.25±0.05 2.00 REF T1433-1 14 1.70±0.10 2.30±0.10 0.40 BSC ---- 0.20±0.03 2.40 REF T1433-2 14 1.70±0.10 2.30±0.10 0.40 BSC ---- 0.20±0.03 2.40 REF [(N/2)-1] x e PACKAGE OUTLINE, 6, 8, 10 & 14L, TDFN, EXPOSED PAD, 3x3x0.80 mm 21-0137 F 2 2 Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ____________________ 11 © 2004 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products. MAX1577Y/MAX1577Z Package Information (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information go to www.maxim-ic.com/packages.)